2,942 research outputs found
Rotation Curves of Spiral Galaxies and Large Scale Structure of Universe under Generalized Einstein Action
We consider an addition of the term which is a square of the scalar curvature
to the Einstein-Hilbert action. Under this generalized action, we attempt to
explain i) the flat rotation curves observed in spiral galaxies, which is
usually attributed to the existence of dark matter, and ii) the contradicting
observations of uniform cosmic microwave background and non-uniform galaxy
distributions against redshift. For the former, we attain the flatness of
velocities, although the magnitudes remain about half of the observations. For
the latter, we obtain a solution with oscillating Hubble parameter under
uniform mass distributions. This solution leads to several peaks of galaxy
number counts as a function of redshift with the first peak corresponding to
the Great Wall.Comment: 16 page
Magnetic-field effects on the in-plane electrical resistivity in the single-crystal LaBaCuO and LaNdSrCuO around : Relating to the field-induced stripe order
Temperature dependence of the in-plane electrical resistivity, , in various magnetic fields has been measured in the single-crystal
LaBaCuO with , 0.10, 0.11 and
LaNdSrCuO with . It has been found that the
superconducting transition curve shows a so-called fan-shape broadening in
magnetic fields for , while it shifts toward the low-temperature side
in parallel with increasing field for and 0.12 where the charge-spin
stripe order is formed at low temperatures. As for , the broadening is
observed in low fields and it changes to the parallel shift in high fields
above 9 T. Moreover, the normal-state value of at low
temperatures markedly increases with increasing field up to 15 T. It is
possible that these pronounced features of are understood in terms of
the magnetic-field-induced stabilization of the stripe order suggested from the
neutron-scattering measurements in the La-214 system. The in
the normal state at low temperatures has been found to be proportional to
ln(1/) for , 0.11 and 0.12. The ln(1/) dependence of is robust even in the stripe-ordered state.Comment: 6 pages, 4 figures, ver. 2 has been accepted for publication in Phys.
Rev.
Vibrationally resolved partial cross sections and asymmetry parameters for carbon K-shell photoionization of the CO_2 molecule
We have measured the vibrationally resolved partial cross sections \sigma_{v_1^{\prime}} and asymmetry parameters \beta_{v_1^{\prime}} for C K-shell photoionization of the CO2 molecule in the Σu shape resonance region above the C K-shell ionization threshold. The positions of both the maxima of \sigma_{v_1^{\prime}} and the minima of \beta_{v_1^{\prime}} move towards the C K-shell threshold with increasing symmetric stretching vibrational excitation v'1 in the C 1s single-hole state. Calculations employing the relaxed-core Hartree–Fock approach reproduce the observed vibrational effects
Preparation and mechanical properties of machinable alumina/mica composites
ArticleJOURNAL OF THE EUROPEAN CERAMIC SOCIETY. 26(9): 1687 -1693 (2006)journal articl
Low-temperature sintering of Z-type hexagonal ferrite by addition of fluorine containing glass powder
The original publication is available at www.springerlink.com.ArticleJOURNAL OF MATERIALS SCIENCE. 40(1): 165-170 (2005)journal articl
Waste on the roadside, 'poi-sute' waste: Its distribution and elution potential of pollutants into environment
ArticleWASTE MANAGEMENT. 29(3):1192-1197 (2009)journal articl
Preparation of M-0 metal/alumina-pillared mica composites (M = Cu, Ni) by in situ reduction of interlayer M2+ ions of alumina-pillared fluorine micas
ArticleMATERIALS RESEARCH BULLETIN. 42(12): 2143-2149 (2007)journal articl
New synthetic method and ionic conductivity of Na-4-mica
ArticleMATERIALS LETTERS. 60(4): 464-466 (2006)journal articl
Effect of layer charge on chemical and physical properties of synthetic K-fluorine micas
The original publication is available at www.springerlink.com.ArticleJOURNAL OF MATERIALS SCIENCE. 40(21): 5597-5602 (2005)journal articl
Crystallization process and some properties of novel transparent machinable calcium-mica glass-ceramics
ArticleCERAMICS INTERNATIONAL. 34(1): 75-79 (2008)journal articl
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